Выделение и вставка

Minint/Controls/PixelCanvas.cs

@@ -7,6 +7,8 @@ using Avalonia.Input;
 using Avalonia.Media;
 using Avalonia.Media.Imaging;
 using Avalonia.Threading;
+using Minint.Core.Models;
+using Minint.ViewModels;
 
 namespace Minint.Controls;
 
@@ -36,23 +38,30 @@ public class PixelCanvas : Control
 
     #region Events for tool interaction
 
-    /// <summary>Fires when the user presses the left mouse button at an image pixel.</summary>
     public event Action<int, int>? ToolDown;
-
-    /// <summary>Fires when the user drags with left button held at an image pixel.</summary>
     public event Action<int, int>? ToolDrag;
-
-    /// <summary>Fires when the cursor moves over the image (pixel coords, or null if outside).</summary>
     public event Action<(int X, int Y)?>? CursorPixelChanged;
-
-    /// <summary>Set by the host to provide preview mask pixels for overlay.</summary>
     public Func<List<(int X, int Y)>?>? GetPreviewMask { get; set; }
 
+    // Selection events
+    public event Action<int, int>? SelectionStart;
+    public event Action<int, int>? SelectionUpdate;
+    public event Action<int, int>? SelectionEnd;
+
+    // Paste events
+    public event Action<int, int>? PasteMoved;
+    public event Action? PasteCommitted;
+    public event Action? PasteCancelled;
+
+    /// <summary>Provides the current EditorViewModel for reading selection/paste state during render.</summary>
+    public EditorViewModel? Editor { get; set; }
+
     #endregion
 
     private readonly Viewport _viewport = new();
     private bool _isPanning;
     private bool _isDrawing;
+    private bool _isSelecting;
     private Point _panStart;
     private double _panStartOffsetX, _panStartOffsetY;
     private bool _viewportInitialized;
@@ -120,6 +129,8 @@ public class PixelCanvas : Control
             DrawPixelGrid(context, imgW, imgH);
 
         DrawToolPreview(context, imgW, imgH);
+        DrawSelectionOverlay(context);
+        DrawPastePreview(context);
 
         int w = imgW, h = imgH;
         Dispatcher.UIThread.Post(() => SyncScrollBars(w, h), DispatcherPriority.Render);
@@ -199,11 +210,9 @@ public class PixelCanvas : Control
             foreach (var (px, py) in mask)
             {
                 var (sx, sy) = _viewport.PixelToScreen(px, py);
-                var r = new Rect(sx, sy, zoom, zoom);
-                context.FillRectangle(previewBrush, r);
+                context.FillRectangle(previewBrush, new Rect(sx, sy, zoom, zoom));
             }
 
-            // Outline around the mask bounding box
             if (mask.Count > 0)
             {
                 int minX = mask[0].X, maxX = mask[0].X;
@@ -216,12 +225,63 @@ public class PixelCanvas : Control
                     if (py > maxY) maxY = py;
                 }
                 var (ox, oy) = _viewport.PixelToScreen(minX, minY);
-                var outlineRect = new Rect(ox, oy, (maxX - minX + 1) * zoom, (maxY - minY + 1) * zoom);
-                context.DrawRectangle(outlinePen, outlineRect);
+                context.DrawRectangle(outlinePen, new Rect(ox, oy, (maxX - minX + 1) * zoom, (maxY - minY + 1) * zoom));
             }
         }
     }
 
+    private void DrawSelectionOverlay(DrawingContext context)
+    {
+        var sel = Editor?.SelectionRectNormalized;
+        if (sel is null) return;
+
+        var (sx, sy, sw, sh) = sel.Value;
+        double zoom = _viewport.Zoom;
+        var (screenX, screenY) = _viewport.PixelToScreen(sx, sy);
+        var rect = new Rect(screenX, screenY, sw * zoom, sh * zoom);
+
+        var fillBrush = new SolidColorBrush(Color.FromArgb(40, 100, 150, 255));
+        context.FillRectangle(fillBrush, rect);
+
+        var borderPen = new Pen(new SolidColorBrush(Color.FromArgb(200, 100, 150, 255)), 1,
+            new DashStyle([4, 4], 0));
+        context.DrawRectangle(borderPen, rect);
+    }
+
+    private void DrawPastePreview(DrawingContext context)
+    {
+        if (Editor is null || !Editor.IsPasting || Editor.Clipboard is null)
+            return;
+
+        var pos = Editor.PastePosition!.Value;
+        var frag = Editor.Clipboard;
+        double zoom = _viewport.Zoom;
+
+        var clip = new Rect(0, 0, Bounds.Width, Bounds.Height);
+        using (context.PushClip(clip))
+        {
+            for (int fy = 0; fy < frag.Height; fy++)
+            {
+                for (int fx = 0; fx < frag.Width; fx++)
+                {
+                    var color = frag.Pixels[fy * frag.Width + fx];
+                    if (color.A == 0) continue;
+
+                    var (sx, sy) = _viewport.PixelToScreen(pos.X + fx, pos.Y + fy);
+                    byte dispA = (byte)(color.A * 180 / 255); // semi-transparent preview
+                    var brush = new SolidColorBrush(Color.FromArgb(dispA, color.R, color.G, color.B));
+                    context.FillRectangle(brush, new Rect(sx, sy, zoom, zoom));
+                }
+            }
+
+            // Border around the floating fragment
+            var (ox, oy) = _viewport.PixelToScreen(pos.X, pos.Y);
+            var borderPen = new Pen(new SolidColorBrush(Color.FromArgb(200, 255, 200, 50)), 1,
+                new DashStyle([3, 3], 0));
+            context.DrawRectangle(borderPen, new Rect(ox, oy, frag.Width * zoom, frag.Height * zoom));
+        }
+    }
+
     #endregion
 
     #region Scrollbar Sync
@@ -284,9 +344,6 @@ public class PixelCanvas : Control
         return (px, py);
     }
 
-    /// <summary>
-    /// Recalculates the pixel coordinate under the cursor after a viewport change.
-    /// </summary>
     private void RecalcCursorPixel()
     {
         if (_lastScreenPos is null) return;
@@ -341,17 +398,35 @@ public class PixelCanvas : Control
             _panStartOffsetX = _viewport.OffsetX;
             _panStartOffsetY = _viewport.OffsetY;
             e.Handled = true;
+            return;
         }
-        else if (props.IsLeftButtonPressed && !_isPanning)
+
+        if (!props.IsLeftButtonPressed || _isPanning) return;
+
+        var pixel = ScreenToPixelClamped(e.GetPosition(this));
+        if (pixel is null) return;
+
+        // Paste mode: left-click commits
+        if (Editor is not null && Editor.IsPasting)
         {
-            var pixel = ScreenToPixelClamped(e.GetPosition(this));
-            if (pixel is not null)
-            {
-                _isDrawing = true;
-                ToolDown?.Invoke(pixel.Value.X, pixel.Value.Y);
-                e.Handled = true;
-            }
+            PasteCommitted?.Invoke();
+            e.Handled = true;
+            return;
         }
+
+        // Select tool: begin rubber-band
+        if (Editor is not null && Editor.ActiveTool == ToolType.Select)
+        {
+            _isSelecting = true;
+            SelectionStart?.Invoke(pixel.Value.X, pixel.Value.Y);
+            e.Handled = true;
+            return;
+        }
+
+        // Regular drawing tools
+        _isDrawing = true;
+        ToolDown?.Invoke(pixel.Value.X, pixel.Value.Y);
+        e.Handled = true;
     }
 
     protected override void OnPointerMoved(PointerEventArgs e)
@@ -378,7 +453,24 @@ public class PixelCanvas : Control
         {
             _lastCursorPixel = pixel;
             CursorPixelChanged?.Invoke(pixel);
+        }
+
+        // Paste mode: floating fragment follows cursor
+        if (Editor is not null && Editor.IsPasting && pixel is not null)
+        {
+            PasteMoved?.Invoke(pixel.Value.X, pixel.Value.Y);
             InvalidateVisual();
+            e.Handled = true;
+            return;
+        }
+
+        // Selection rubber-band drag
+        if (_isSelecting && pixel is not null)
+        {
+            SelectionUpdate?.Invoke(pixel.Value.X, pixel.Value.Y);
+            InvalidateVisual();
+            e.Handled = true;
+            return;
         }
 
         if (_isDrawing && pixel is not null)
@@ -386,6 +478,10 @@ public class PixelCanvas : Control
             ToolDrag?.Invoke(pixel.Value.X, pixel.Value.Y);
             e.Handled = true;
         }
+        else
+        {
+            InvalidateVisual();
+        }
     }
 
     protected override void OnPointerReleased(PointerReleasedEventArgs e)
@@ -397,6 +493,15 @@ public class PixelCanvas : Control
             _isPanning = false;
             e.Handled = true;
         }
+        else if (_isSelecting && e.InitialPressMouseButton == MouseButton.Left)
+        {
+            _isSelecting = false;
+            var pixel = ScreenToPixelClamped(e.GetPosition(this));
+            if (pixel is not null)
+                SelectionEnd?.Invoke(pixel.Value.X, pixel.Value.Y);
+            InvalidateVisual();
+            e.Handled = true;
+        }
         else if (_isDrawing && e.InitialPressMouseButton == MouseButton.Left)
         {
             _isDrawing = false;
@@ -416,6 +521,33 @@ public class PixelCanvas : Control
         }
     }
 
+    protected override void OnKeyDown(KeyEventArgs e)
+    {
+        base.OnKeyDown(e);
+
+        if (e.Key == Key.Escape)
+        {
+            if (Editor is not null && Editor.IsPasting)
+            {
+                PasteCancelled?.Invoke();
+                InvalidateVisual();
+                e.Handled = true;
+            }
+            else if (Editor is not null && Editor.HasSelection)
+            {
+                Editor.ClearSelection();
+                InvalidateVisual();
+                e.Handled = true;
+            }
+        }
+        else if (e.Key == Key.Enter && Editor is not null && Editor.IsPasting)
+        {
+            PasteCommitted?.Invoke();
+            InvalidateVisual();
+            e.Handled = true;
+        }
+    }
+
     #endregion
 
     protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)

Minint/ViewModels/EditorViewModel.cs

@@ -13,6 +13,11 @@ using Minint.Core.Services.Impl;
 
 namespace Minint.ViewModels;
 
+/// <summary>
+/// Palette-independent clipboard fragment: stores resolved RGBA pixels.
+/// </summary>
+public sealed record ClipboardFragment(int Width, int Height, RgbaColor[] Pixels);
+
 public partial class EditorViewModel : ViewModelBase
 {
     private readonly ICompositor _compositor = new Compositor();
@@ -66,6 +71,27 @@ public partial class EditorViewModel : ViewModelBase
 
     public RgbaColor SelectedColor => new(_previewColor.R, _previewColor.G, _previewColor.B, _previewColor.A);
 
+    // Selection state (Select tool rubber-band)
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(HasSelection))]
+    private (int X, int Y, int W, int H)? _selectionRect;
+
+    public bool HasSelection => SelectionRect is not null;
+
+    // Clipboard
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(HasClipboard))]
+    private ClipboardFragment? _clipboard;
+
+    public bool HasClipboard => Clipboard is not null;
+
+    // Paste mode
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(IsPasting))]
+    private (int X, int Y)? _pastePosition;
+
+    public bool IsPasting => PastePosition is not null;
+
     [ObservableProperty]
     [NotifyPropertyChangedFor(nameof(Title))]
     private string? _filePath;
@@ -113,10 +139,6 @@ public partial class EditorViewModel : ViewModelBase
         SyncLayersAndCanvas(doc);
     }
 
-    /// <summary>
-    /// Re-syncs the Documents observable collection after an external modification
-    /// to Container.Documents (e.g. pattern generation adding a document).
-    /// </summary>
     public void SyncAfterExternalChange() => SyncDocumentsList();
 
     private void SyncDocumentsList()
@@ -191,7 +213,7 @@ public partial class EditorViewModel : ViewModelBase
     private void RemoveDocument()
     {
         if (Container is null || ActiveDocument is null) return;
-        if (Container.Documents.Count <= 1) return; // keep at least one
+        if (Container.Documents.Count <= 1) return;
 
         var doc = ActiveDocument;
         int idx = Container.Documents.IndexOf(doc);
@@ -203,10 +225,7 @@ public partial class EditorViewModel : ViewModelBase
     }
 
     [RelayCommand]
-    private void RenameDocument()
-    {
-        // Triggered via UI text edit — the Name property is directly editable via TextBox
-    }
+    private void RenameDocument() { }
 
     [RelayCommand]
     private void MoveDocumentUp()
@@ -254,7 +273,7 @@ public partial class EditorViewModel : ViewModelBase
     private void RemoveLayer()
     {
         if (ActiveDocument is null || ActiveLayer is null) return;
-        if (ActiveDocument.Layers.Count <= 1) return; // keep at least one
+        if (ActiveDocument.Layers.Count <= 1) return;
 
         UnsubscribeLayerVisibility();
         var layer = ActiveLayer;
@@ -329,6 +348,8 @@ public partial class EditorViewModel : ViewModelBase
         if (px < 0 || px >= w || py < 0 || py >= h)
             return;
 
+        if (ActiveTool == ToolType.Select) return; // handled separately
+
         switch (ActiveTool)
         {
             case ToolType.Brush:
@@ -353,7 +374,7 @@ public partial class EditorViewModel : ViewModelBase
 
     public void OnToolDrag(int px, int py)
     {
-        if (ActiveTool == ToolType.Fill) return;
+        if (ActiveTool is ToolType.Fill or ToolType.Select) return;
         OnToolDown(px, py);
     }
 
@@ -361,7 +382,7 @@ public partial class EditorViewModel : ViewModelBase
     {
         if (PreviewCenter is null || Container is null)
             return null;
-        if (ActiveTool == ToolType.Fill)
+        if (ActiveTool is ToolType.Fill or ToolType.Select)
             return null;
 
         var (cx, cy) = PreviewCenter.Value;
@@ -369,36 +390,161 @@ public partial class EditorViewModel : ViewModelBase
     }
 
     [RelayCommand]
-    private void SelectBrush() => ActiveTool = ToolType.Brush;
+    private void SelectBrush() { CancelPasteMode(); ActiveTool = ToolType.Brush; }
 
     [RelayCommand]
-    private void SelectEraser() => ActiveTool = ToolType.Eraser;
+    private void SelectEraser() { CancelPasteMode(); ActiveTool = ToolType.Eraser; }
 
     [RelayCommand]
-    private void SelectFill() => ActiveTool = ToolType.Fill;
+    private void SelectFill() { CancelPasteMode(); ActiveTool = ToolType.Fill; }
+
+    [RelayCommand]
+    private void SelectSelectTool() { CancelPasteMode(); ActiveTool = ToolType.Select; }
 
     #endregion
 
-    #region Fragment copy (A4)
+    #region Selection + Copy/Paste (A4)
 
-    /// <summary>
-    /// Copies a rectangular fragment from <paramref name="srcDoc"/> active layer
-    /// to <paramref name="dstDoc"/> active layer.
-    /// </summary>
-    public void CopyFragment(
-        MinintDocument srcDoc, int srcLayerIndex,
-        int srcX, int srcY, int regionW, int regionH,
-        MinintDocument dstDoc, int dstLayerIndex,
-        int dstX, int dstY)
+    /// <summary>Called by PixelCanvas when selection drag starts.</summary>
+    public void BeginSelection(int px, int py)
     {
-        if (Container is null) return;
-        _fragmentService.CopyFragment(
-            srcDoc, srcLayerIndex, srcX, srcY, regionW, regionH,
-            dstDoc, dstLayerIndex, dstX, dstY,
-            Container.Width, Container.Height);
+        SelectionRect = (px, py, 0, 0);
+    }
+
+    /// <summary>Called by PixelCanvas as the user drags.</summary>
+    public void UpdateSelection(int px, int py)
+    {
+        if (SelectionRect is null) return;
+        var s = SelectionRect.Value;
+        int x = Math.Min(s.X, px);
+        int y = Math.Min(s.Y, py);
+        int w = Math.Abs(px - s.X) + 1;
+        int h = Math.Abs(py - s.Y) + 1;
+        // Store normalized rect but keep original anchor in _selAnchor
+        _selectionRectNormalized = (x, y, w, h);
+    }
+
+    /// <summary>Called by PixelCanvas when mouse is released.</summary>
+    public void FinishSelection(int px, int py)
+    {
+        if (SelectionRect is null) return;
+        var s = SelectionRect.Value;
+        int x0 = Math.Min(s.X, px);
+        int y0 = Math.Min(s.Y, py);
+        int rw = Math.Abs(px - s.X) + 1;
+        int rh = Math.Abs(py - s.Y) + 1;
+        if (Container is not null)
+        {
+            x0 = Math.Max(0, x0);
+            y0 = Math.Max(0, y0);
+            rw = Math.Min(rw, Container.Width - x0);
+            rh = Math.Min(rh, Container.Height - y0);
+        }
+        if (rw <= 0 || rh <= 0)
+        {
+            SelectionRect = null;
+            _selectionRectNormalized = null;
+            return;
+        }
+        SelectionRect = (x0, y0, rw, rh);
+        _selectionRectNormalized = SelectionRect;
+    }
+
+    private (int X, int Y, int W, int H)? _selectionRectNormalized;
+
+    /// <summary>The normalized (positive W/H, clamped) selection rectangle for rendering.</summary>
+    public (int X, int Y, int W, int H)? SelectionRectNormalized => _selectionRectNormalized;
+
+    [RelayCommand]
+    private void CopySelection()
+    {
+        if (SelectionRect is null || ActiveDocument is null || ActiveLayer is null || Container is null)
+            return;
+
+        var (sx, sy, sw, sh) = SelectionRect.Value;
+        int cw = Container.Width;
+        var palette = ActiveDocument.Palette;
+        var srcPixels = ActiveLayer.Pixels;
+        var buf = new RgbaColor[sw * sh];
+
+        for (int dy = 0; dy < sh; dy++)
+        {
+            int srcRow = sy + dy;
+            for (int dx = 0; dx < sw; dx++)
+            {
+                int srcCol = sx + dx;
+                int idx = srcPixels[srcRow * cw + srcCol];
+                buf[dy * sw + dx] = idx < palette.Count ? palette[idx] : RgbaColor.Transparent;
+            }
+        }
+
+        Clipboard = new ClipboardFragment(sw, sh, buf);
+    }
+
+    [RelayCommand]
+    private void PasteClipboard()
+    {
+        if (Clipboard is null) return;
+        PastePosition = (0, 0);
+    }
+
+    public void MovePaste(int px, int py)
+    {
+        if (!IsPasting) return;
+        PastePosition = (px, py);
+    }
+
+    [RelayCommand]
+    public void CommitPaste()
+    {
+        if (!IsPasting || Clipboard is null || ActiveDocument is null || ActiveLayer is null || Container is null)
+            return;
+
+        var (px, py) = PastePosition!.Value;
+        int cw = Container.Width, ch = Container.Height;
+        var frag = Clipboard;
+        var dstPixels = ActiveLayer.Pixels;
+
+        for (int fy = 0; fy < frag.Height; fy++)
+        {
+            int dy = py + fy;
+            if (dy < 0 || dy >= ch) continue;
+            for (int fx = 0; fx < frag.Width; fx++)
+            {
+                int dx = px + fx;
+                if (dx < 0 || dx >= cw) continue;
+                var color = frag.Pixels[fy * frag.Width + fx];
+                if (color.A == 0) continue; // skip transparent
+                int colorIdx = ActiveDocument.EnsureColorCached(color);
+                dstPixels[dy * cw + dx] = colorIdx;
+            }
+        }
+
+        PastePosition = null;
+        SelectionRect = null;
+        _selectionRectNormalized = null;
         RefreshCanvas();
     }
 
+    [RelayCommand]
+    public void CancelPaste()
+    {
+        PastePosition = null;
+    }
+
+    public void ClearSelection()
+    {
+        SelectionRect = null;
+        _selectionRectNormalized = null;
+    }
+
+    private void CancelPasteMode()
+    {
+        PastePosition = null;
+        SelectionRect = null;
+        _selectionRectNormalized = null;
+    }
+
     #endregion
 
     #region Canvas rendering

Minint/ViewModels/MainWindowViewModel.cs

@@ -1,6 +1,5 @@
 using System;
 using System.IO;
-using System.Linq;
 using System.Threading.Tasks;
 using Avalonia.Controls;
 using Avalonia.Platform.Storage;
@@ -153,49 +152,6 @@ public partial class MainWindowViewModel : ViewModelBase
 
     #endregion
 
-    #region Copy fragment (A4)
-
-    [RelayCommand]
-    private async Task CopyFragmentAsync()
-    {
-        if (Editor.Container is null || Owner is not Window window) return;
-
-        var docs = Editor.Container.Documents;
-        if (docs.Count == 0) return;
-
-        var dialog = new CopyFragmentDialog(docs, Editor.Container.Width, Editor.Container.Height);
-        var result = await dialog.ShowDialog<bool?>(window);
-        if (result != true) return;
-
-        if (dialog.SourceDocument is null || dialog.DestDocument is null)
-        {
-            StatusText = "Copy failed: no document selected.";
-            return;
-        }
-        if (dialog.SourceLayerIndex < 0 || dialog.DestLayerIndex < 0)
-        {
-            StatusText = "Copy failed: no layer selected.";
-            return;
-        }
-
-        try
-        {
-            Editor.CopyFragment(
-                dialog.SourceDocument, dialog.SourceLayerIndex,
-                dialog.SourceX, dialog.SourceY,
-                dialog.FragmentWidth, dialog.FragmentHeight,
-                dialog.DestDocument, dialog.DestLayerIndex,
-                dialog.DestX, dialog.DestY);
-            StatusText = $"Copied {dialog.FragmentWidth}×{dialog.FragmentHeight} fragment.";
-        }
-        catch (Exception ex)
-        {
-            StatusText = $"Copy failed: {ex.Message}";
-        }
-    }
-
-    #endregion
-
     #region Pattern generation (Б4)
 
     [RelayCommand]

Minint/ViewModels/ToolType.cs

@@ -4,5 +4,6 @@ public enum ToolType
 {
     Brush,
     Eraser,
-    Fill
+    Fill,
+    Select
 }

Minint/ViewModels/ToolTypeConverters.cs

@@ -13,6 +13,7 @@ public static class ToolTypeConverters
     public static readonly IValueConverter IsBrush = new ToolTypeConverter(ToolType.Brush);
     public static readonly IValueConverter IsEraser = new ToolTypeConverter(ToolType.Eraser);
     public static readonly IValueConverter IsFill = new ToolTypeConverter(ToolType.Fill);
+    public static readonly IValueConverter IsSelect = new ToolTypeConverter(ToolType.Select);
 
     private sealed class ToolTypeConverter(ToolType target) : IValueConverter
     {

Minint/Views/CopyFragmentDialog.axaml

@@ -1,51 +0,0 @@
-<Window xmlns="https://github.com/avaloniaui"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        x:Class="Minint.Views.CopyFragmentDialog"
-        Title="Copy Fragment"
-        Width="380" Height="420"
-        WindowStartupLocation="CenterOwner"
-        CanResize="False"
-        SizeToContent="Height">
-    <StackPanel Margin="16" Spacing="8">
-        <TextBlock Text="Source" FontWeight="SemiBold"/>
-        <Grid ColumnDefinitions="100,*" RowDefinitions="Auto,Auto,Auto,Auto,Auto" RowSpacing="4" ColumnSpacing="8">
-            <TextBlock Grid.Row="0" Grid.Column="0" Text="Document:" VerticalAlignment="Center"/>
-            <ComboBox Grid.Row="0" Grid.Column="1" x:Name="SrcDocCombo"
-                      HorizontalAlignment="Stretch"/>
-            <TextBlock Grid.Row="1" Grid.Column="0" Text="Layer:" VerticalAlignment="Center"/>
-            <ComboBox Grid.Row="1" Grid.Column="1" x:Name="SrcLayerCombo"
-                      HorizontalAlignment="Stretch"/>
-            <TextBlock Grid.Row="2" Grid.Column="0" Text="X:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="2" Grid.Column="1" x:Name="SrcX" Value="0" Minimum="0" FormatString="0"/>
-            <TextBlock Grid.Row="3" Grid.Column="0" Text="Y:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="3" Grid.Column="1" x:Name="SrcY" Value="0" Minimum="0" FormatString="0"/>
-        </Grid>
-
-        <Grid ColumnDefinitions="100,*" RowDefinitions="Auto,Auto" RowSpacing="4" ColumnSpacing="8" Margin="0,4,0,0">
-            <TextBlock Grid.Row="0" Grid.Column="0" Text="Width:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="0" Grid.Column="1" x:Name="RegionW" Value="16" Minimum="1" FormatString="0"/>
-            <TextBlock Grid.Row="1" Grid.Column="0" Text="Height:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="1" Grid.Column="1" x:Name="RegionH" Value="16" Minimum="1" FormatString="0"/>
-        </Grid>
-
-        <Separator Margin="0,8"/>
-        <TextBlock Text="Destination" FontWeight="SemiBold"/>
-        <Grid ColumnDefinitions="100,*" RowDefinitions="Auto,Auto,Auto,Auto" RowSpacing="4" ColumnSpacing="8">
-            <TextBlock Grid.Row="0" Grid.Column="0" Text="Document:" VerticalAlignment="Center"/>
-            <ComboBox Grid.Row="0" Grid.Column="1" x:Name="DstDocCombo"
-                      HorizontalAlignment="Stretch"/>
-            <TextBlock Grid.Row="1" Grid.Column="0" Text="Layer:" VerticalAlignment="Center"/>
-            <ComboBox Grid.Row="1" Grid.Column="1" x:Name="DstLayerCombo"
-                      HorizontalAlignment="Stretch"/>
-            <TextBlock Grid.Row="2" Grid.Column="0" Text="X:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="2" Grid.Column="1" x:Name="DstX" Value="0" Minimum="0" FormatString="0"/>
-            <TextBlock Grid.Row="3" Grid.Column="0" Text="Y:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="3" Grid.Column="1" x:Name="DstY" Value="0" Minimum="0" FormatString="0"/>
-        </Grid>
-
-        <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Spacing="8" Margin="0,12,0,0">
-            <Button Content="Copy" x:Name="OkButton" IsDefault="True" Padding="16,6"/>
-            <Button Content="Cancel" x:Name="CancelButton" IsCancel="True" Padding="16,6"/>
-        </StackPanel>
-    </StackPanel>
-</Window>

Minint/Views/CopyFragmentDialog.axaml.cs

@@ -1,91 +0,0 @@
-using System;
-using System.Collections.Generic;
-using Avalonia.Controls;
-using Avalonia.Interactivity;
-using Minint.Core.Models;
-
-namespace Minint.Views;
-
-public partial class CopyFragmentDialog : Window
-{
-    private readonly List<MinintDocument> _documents;
-
-    public MinintDocument? SourceDocument => SrcDocCombo.SelectedItem as MinintDocument;
-    public int SourceLayerIndex => SrcLayerCombo.SelectedIndex;
-    public int SourceX => (int)(SrcX.Value ?? 0);
-    public int SourceY => (int)(SrcY.Value ?? 0);
-    public int FragmentWidth => (int)(RegionW.Value ?? 1);
-    public int FragmentHeight => (int)(RegionH.Value ?? 1);
-    public MinintDocument? DestDocument => DstDocCombo.SelectedItem as MinintDocument;
-    public int DestLayerIndex => DstLayerCombo.SelectedIndex;
-    public int DestX => (int)(DstX.Value ?? 0);
-    public int DestY => (int)(DstY.Value ?? 0);
-
-    public CopyFragmentDialog()
-    {
-        _documents = [];
-        InitializeComponent();
-    }
-
-    public CopyFragmentDialog(List<MinintDocument> documents, int maxW, int maxH) : this()
-    {
-        _documents = documents;
-
-        SrcDocCombo.ItemsSource = documents;
-        SrcDocCombo.DisplayMemberBinding = new Avalonia.Data.Binding("Name");
-        DstDocCombo.ItemsSource = documents;
-        DstDocCombo.DisplayMemberBinding = new Avalonia.Data.Binding("Name");
-
-        SrcX.Maximum = maxW - 1;
-        SrcY.Maximum = maxH - 1;
-        DstX.Maximum = maxW - 1;
-        DstY.Maximum = maxH - 1;
-        RegionW.Maximum = maxW;
-        RegionH.Maximum = maxH;
-
-        if (documents.Count > 0)
-        {
-            SrcDocCombo.SelectedIndex = 0;
-            DstDocCombo.SelectedIndex = documents.Count > 1 ? 1 : 0;
-        }
-
-        SrcDocCombo.SelectionChanged += (_, _) => UpdateSrcLayers();
-        DstDocCombo.SelectionChanged += (_, _) => UpdateDstLayers();
-
-        UpdateSrcLayers();
-        UpdateDstLayers();
-
-        OkButton.Click += OnOkClick;
-        CancelButton.Click += OnCancelClick;
-    }
-
-    private void UpdateSrcLayers()
-    {
-        if (SrcDocCombo.SelectedItem is MinintDocument doc)
-        {
-            SrcLayerCombo.ItemsSource = doc.Layers;
-            SrcLayerCombo.DisplayMemberBinding = new Avalonia.Data.Binding("Name");
-            if (doc.Layers.Count > 0) SrcLayerCombo.SelectedIndex = 0;
-        }
-    }
-
-    private void UpdateDstLayers()
-    {
-        if (DstDocCombo.SelectedItem is MinintDocument doc)
-        {
-            DstLayerCombo.ItemsSource = doc.Layers;
-            DstLayerCombo.DisplayMemberBinding = new Avalonia.Data.Binding("Name");
-            if (doc.Layers.Count > 0) DstLayerCombo.SelectedIndex = 0;
-        }
-    }
-
-    private void OnOkClick(object? sender, RoutedEventArgs e)
-    {
-        Close(true);
-    }
-
-    private void OnCancelClick(object? sender, RoutedEventArgs e)
-    {
-        Close(false);
-    }
-}

Minint/Views/MainWindow.axaml

@@ -27,8 +27,12 @@
                 <MenuItem Header="Save _As…" Command="{Binding SaveFileAsCommand}" HotKey="Ctrl+Shift+S"/>
             </MenuItem>
             <MenuItem Header="_Edit">
-                <MenuItem Header="Copy _Fragment…" Command="{Binding CopyFragmentCommand}"
-                          ToolTip.Tip="Copy a rectangular region between documents"/>
+                <MenuItem Header="_Copy" Command="{Binding Editor.CopySelectionCommand}"
+                          HotKey="Ctrl+C"
+                          ToolTip.Tip="Copy the selected region to clipboard"/>
+                <MenuItem Header="_Paste" Command="{Binding Editor.PasteClipboardCommand}"
+                          HotKey="Ctrl+V"
+                          ToolTip.Tip="Paste clipboard fragment onto the canvas"/>
             </MenuItem>
             <MenuItem Header="_Image">
                 <MenuItem Header="Adjust _Contrast…" Command="{Binding ApplyContrastCommand}"
@@ -62,6 +66,10 @@
                              ToolTip.Tip="Fill tool — flood fill with selected color"
                              IsChecked="{Binding Editor.ActiveTool, Converter={x:Static vm:ToolTypeConverters.IsFill}}"
                              Command="{Binding Editor.SelectFillCommand}"/>
+                <RadioButton GroupName="Tool" Content="Select"
+                             ToolTip.Tip="Select tool — drag to select a region, then Copy/Paste"
+                             IsChecked="{Binding Editor.ActiveTool, Converter={x:Static vm:ToolTypeConverters.IsSelect}}"
+                             Command="{Binding Editor.SelectSelectToolCommand}"/>
 
                 <Separator/>
 

Minint/Views/MainWindow.axaml.cs

@@ -37,9 +37,19 @@ public partial class MainWindow : Window
 
     private static void WireCanvasEvents(PixelCanvas canvas, EditorViewModel editor)
     {
+        canvas.Editor = editor;
+
         canvas.ToolDown += (px, py) => editor.OnToolDown(px, py);
         canvas.ToolDrag += (px, py) => editor.OnToolDrag(px, py);
         canvas.CursorPixelChanged += pixel => editor.PreviewCenter = pixel;
         canvas.GetPreviewMask = () => editor.GetPreviewMask();
+
+        canvas.SelectionStart += (px, py) => editor.BeginSelection(px, py);
+        canvas.SelectionUpdate += (px, py) => editor.UpdateSelection(px, py);
+        canvas.SelectionEnd += (px, py) => { editor.FinishSelection(px, py); canvas.InvalidateVisual(); };
+
+        canvas.PasteMoved += (px, py) => editor.MovePaste(px, py);
+        canvas.PasteCommitted += () => { editor.CommitPaste(); canvas.InvalidateVisual(); };
+        canvas.PasteCancelled += () => { editor.CancelPaste(); canvas.InvalidateVisual(); };
     }
 }